You go to a halloween fair with a big ferris wheel. the wheel has ten seats, and two people are placed on each seat. every minute a seat passes by the exit platform. at 11 a. m. the ferris wheel opens for 30 minutes - how many people have ridden the wheel during this time?

42

Explanation:

The Ferris wheel opens for 30 minutes at 11 a.m. Now, the first seat is filled at 11 a.m. Every minute a seat passes by the platform so every minute a seat is filled. This means that from 11:00 a.m. to 11:09 a.m. the seats are filled. At 11:10 a.m., the ride starts. From 11:10 to 11:30, the time duration is 21 minutes. Each minute a seat passes by the exit platform and 2 people leave the ride through the exit platform. Hence, a total of 42 people have ridden during this time.

not  

cuba  

russia  

iraq  

el salvador  

explanation:

known as the land of volcanoes, el salvador has visit seismic tremors and volcanic movement. it is the main nation in central america that does not have a coastline on the caribbean sea. about portion of all salvadorans live in the wide open. they are poor and don't have power or running water in their homes. in 1525, pedro de alvarado, a lieutenant of cortés's, vanquished el salvador. el salvador, with alternate nations of central america, pronounced its freedom from spain on sept. 15, 1821, and was a piece of a league of central american states until the point when that association broke up in 1838.